/Engine/Plugins/Animation/ControlRig/Source/ControlRig/Public/ControlRigValidationPass.h
Called whenever the rig being validated question is changed.
virtual void OnSubjectChanged ( [UControlRig](API\Plugins\ControlRig\UControlRig) * InControlRig, [FControlRigValidationContext](API\Plugins\ControlRig\FControlRigValidationContext) * InContext )